Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751925AbbLIUCQ (ORCPT ); Wed, 9 Dec 2015 15:02:16 -0500 Received: from mail.kernel.org ([198.145.29.136]:44976 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751433AbbLIUCK (ORCPT ); Wed, 9 Dec 2015 15:02:10 -0500 Date: Wed, 9 Dec 2015 14:02:00 -0600 From: Rob Herring To: Peter Ujfalusi Cc: vinod.koul@intel.com, arnd@arndb.de, tony@atomide.com, linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, devicetree@vger.kernel.org, balbi@ti.com, linux-kernel@vger.kernel.org, nsekhar@ti.com Subject: Re: [PATCH for 4.4 1/2] dmaengine: edma: DT: Change memcpy channel array from 16bit to 32bit type Message-ID: <20151209200200.GA22525@rob-hp-laptop> References: <1449649091-9848-1-git-send-email-peter.ujfalusi@ti.com> <1449649091-9848-2-git-send-email-peter.ujfalusi@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1449649091-9848-2-git-send-email-peter.ujfalusi@ti.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4799 Lines: 122 On Wed, Dec 09, 2015 at 10:18:10AM +0200, Peter Ujfalusi wrote: > This change makes the DT file to be easier to read since the memcpy > channels array does not need the '/bits/ 16' to be specified, which might > confuse some people. Why? I don't see the point of this change and plus you are breaking compatibility with the change. There was little reason to do 16-bit values to start with, but that's now the ABI. Rob > Signed-off-by: Peter Ujfalusi > --- > Documentation/devicetree/bindings/dma/ti-edma.txt | 5 ++--- > drivers/dma/edma.c | 22 ++++++++++------------ > include/linux/platform_data/edma.h | 2 +- > 3 files changed, 13 insertions(+), 16 deletions(-) > > diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt > index d3d0a4fb1c73..ae8b8f1d6e69 100644 > --- a/Documentation/devicetree/bindings/dma/ti-edma.txt > +++ b/Documentation/devicetree/bindings/dma/ti-edma.txt > @@ -22,8 +22,7 @@ Required properties: > Optional properties: > - ti,hwmods: Name of the hwmods associated to the eDMA CC > - ti,edma-memcpy-channels: List of channels allocated to be used for memcpy, iow > - these channels will be SW triggered channels. The list must > - contain 16 bits numbers, see example. > + these channels will be SW triggered channels. See example. > - ti,edma-reserved-slot-ranges: PaRAM slot ranges which should not be used by > the driver, they are allocated to be used by for example the > DSP. See example. > @@ -56,7 +55,7 @@ edma: edma@49000000 { > ti,tptcs = <&edma_tptc0 7>, <&edma_tptc1 7>, <&edma_tptc2 0>; > > /* Channel 20 and 21 is allocated for memcpy */ > - ti,edma-memcpy-channels = /bits/ 16 <20 21>; > + ti,edma-memcpy-channels = <20 21>; > /* The following PaRAM slots are reserved: 35-45 and 100-110 */ > ti,edma-reserved-slot-ranges = /bits/ 16 <35 10>, > /bits/ 16 <100 10>; > diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c > index 2af8f32bba0b..89fc17f3a6ff 100644 > --- a/drivers/dma/edma.c > +++ b/drivers/dma/edma.c > @@ -1752,16 +1752,14 @@ static enum dma_status edma_tx_status(struct dma_chan *chan, > return ret; > } > > -static bool edma_is_memcpy_channel(int ch_num, u16 *memcpy_channels) > +static bool edma_is_memcpy_channel(int ch_num, s32 *memcpy_channels) > { > - s16 *memcpy_ch = memcpy_channels; > - > if (!memcpy_channels) > return false; > - while (*memcpy_ch != -1) { > - if (*memcpy_ch == ch_num) > + while (*memcpy_channels != -1) { > + if (*memcpy_channels == ch_num) > return true; > - memcpy_ch++; > + memcpy_channels++; > } > return false; > } > @@ -1775,7 +1773,7 @@ static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode) > { > struct dma_device *s_ddev = &ecc->dma_slave; > struct dma_device *m_ddev = NULL; > - s16 *memcpy_channels = ecc->info->memcpy_channels; > + s32 *memcpy_channels = ecc->info->memcpy_channels; > int i, j; > > dma_cap_zero(s_ddev->cap_mask); > @@ -1996,16 +1994,16 @@ static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev, > prop = of_find_property(dev->of_node, "ti,edma-memcpy-channels", &sz); > if (prop) { > const char pname[] = "ti,edma-memcpy-channels"; > - size_t nelm = sz / sizeof(s16); > - s16 *memcpy_ch; > + size_t nelm = sz / sizeof(s32); > + s32 *memcpy_ch; > > - memcpy_ch = devm_kcalloc(dev, nelm + 1, sizeof(s16), > + memcpy_ch = devm_kcalloc(dev, nelm + 1, sizeof(s32), > GFP_KERNEL); > if (!memcpy_ch) > return ERR_PTR(-ENOMEM); > > - ret = of_property_read_u16_array(dev->of_node, pname, > - (u16 *)memcpy_ch, nelm); > + ret = of_property_read_u32_array(dev->of_node, pname, > + (u32 *)memcpy_ch, nelm); > if (ret) > return ERR_PTR(ret); > > diff --git a/include/linux/platform_data/edma.h b/include/linux/platform_data/edma.h > index 105700e62ea1..0a533f94438f 100644 > --- a/include/linux/platform_data/edma.h > +++ b/include/linux/platform_data/edma.h > @@ -76,7 +76,7 @@ struct edma_soc_info { > struct edma_rsv_info *rsv; > > /* List of channels allocated for memcpy, terminated with -1 */ > - s16 *memcpy_channels; > + s32 *memcpy_channels; > > s8 (*queue_priority_mapping)[2]; > const s16 (*xbar_chans)[2]; > -- > 2.6.3 > > -- > To unsubscribe from this list: send the line "unsubscribe devicetree" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/